162 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
Family CREPIDULIDAE. 
Genus CREPIDULA Lamarck, 1801. 
Section CREPIBULA s. s. 
CREPIDULA GRANDIS Middendorff, 1849. 
Mai. Rossica, p. 101. — Teyon, Man., vol. 8, pi. 37, fig*. 33. 
Cape Franklin, Arctic Ocean, south and east to Sitka, Alaska. Also Kam- 
chatka. 
CREPIDULA ONYX Sowerby, 1825. 
Genera of Shells, No. 23, fig. 2. 
Monterey, California, to Panama. ^ 
CREPIDULA NORRISIARUM Williamson, 1905. 
Nautilus, vol. 19, No. 5, p. 51. ' y / 
San Pedro, on Norrisia only. f 
CREPIDULA EXCAVATA Broderip, 1834. 
Proc. Zool. Soc., p. 46 ; Trans., vol. 1, p. 205, pi. 29, fig. 7. 
Monterey, California, to Payta, Peru. 
CREPIDULA EXCAVATA NATICARUM Williamson. 1905. 
Nautilus, vol. 19, No. 5, p. 50. ^ 
San Pedro, on Natica. 
CREPIDULA INCURVA Broderip, 1834. 
Proc. Zool. Soc., p. 40 ; Trans., vol. 1, p. 204, pi. 29, fig. 6. 
San Pedro, California, to Panama. 
CREPIDULA ORBICULATA Dail, 1919. 
Proc. U. S. Nat. Mus., vol. 56, No. 2295, p. 351. 
Bering Sea to San Diego, California. 
CREPIDULA CONVEXA GLAUCA Say, 1822. 
Journ. Acad. Nat. Sci. Phila., vol. 2, p. 226. — Tryon, Man., vol. 8, pi. 36, 
fig. 9. 
Alameda, California. Introduced with Atlantic seed oysters. 
CREPIDULA ADUNCA Sowerby, 1825. 
Tankerville Cat. App., p. vii. No. 828. — Keep, West Coast Shells, p. 207, 
fig. 201. 
Vancouver Island to Cape San Lucas. 
CREPIDULA ACULEATA Gmelin, 1792. 
Syst. Nat., vol. 7, p. 3693. — Tryon, Man., vol. 8, pi. 39, figs. 61-63. 
Santa Barbara, California, to Valparaiso, Chile. 
Subgenus Crepipatella Lesson, 1830. 
CREPIPATELLA LINGULATA Gould, 1846. 
Proc. Boston Soc. Nat. Hist., vol. 2, p. 160; Rep. U. S. Bxpl. Exp., Moll., 
figs. 481 a-c. 
Bering Sea to Panama. 
